Registering new truck, outdated MN laws

So I am in the process of registering a new truck. The form says register trucks as a passenger vehicle if "the manufacturers rated capacity is 3/4 ton or less"
So yea, because the F150 has a rated capacity of 1,840 lbs I can save a bunch of money and register it on gross weight.

However, I call the registering office and they say if it is a F150 it is a "1/2 ton" and they will register it under passenger.
What was the last year that an F150 had a rating of 1,000 lbs? 35-40 years ago?

I feel no matter what they "say" I should go by; considering the actual text on the application form says "manufacturers rated capacity" legally I should be registering on weight.
Thoughts?

It's not your fault the DMV doesn't know anything about modern trucks. If they let you register it as a passenger vehicle and it saves you money go for it. It actually makes sense to me anyway because modern 150/1500 series pickups are generally better suited for carrying passengers than cargo even if their rated capacity is over 1500 pounds.

If they let you register it as a passenger vehicle and it saves you money go for it.

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Actually registering by weight is $120 per year vs $351 for passanger.
The passenger class does decrease but after some math, I would be breaking even only after 25 years of use, which I doubt the truck will last. So for the first 25 years it is cheaper to register by weight.